Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1782/tune.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8731-tune.ps) >>/Users/jc/w/tmp/Tune-8731-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1782/tune.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_87311.log 290411 Log file, useful mostly for debugging
Tune-8731-get.log 3942 Log file, useful mostly for debugging
Tune-8731-tune.abc 141 ABC music file with the extracted tune(s)
Tune-8731-tune.ps 6 PostScript
Tune-8731-tune.txt 141 Plain-text file with the extracted tune(s)
Tune-87313-2270_the_Belles_of_Tipperary.abc 468 ABC music file with the extracted tune(s)
Tune-87313-2270_the_Belles_of_Tipperary.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-87313-2270_the_Belles_of_Tipperary.ps 34158 PostScript
Tune-87313-2270_the_Belles_of_Tipperary.txt 468 Plain-text file with the extracted tune(s)
Tune-87313-get.log 5699 Log file, useful mostly for debugging
Tune-87317-get.log 3248 Log file, useful mostly for debugging
These files should be available for 24 hours.